45 - 160 - 20%loss ie 160 is 80% of the toatl value x...80/100x = 160, x = 200.. 200 is buying price of 45 mangoes. and selling price is 160.. each mango will cost 200/45 ie 40/9 let 45 + n be equal to z. ie total mangoes and total selling price is 272. objective is to make 20% profit on the whole b...

Many of the questions with which you're practicing have been previously discussed on this board. The BTG search tool is very useful. Here are a couple of threads discussion this question: http://www.beatthegmat.com/mgmat-cat-2-ps-question-3-t47933.html and http://www.beatthegmat.com/3-sets-prob-t35...

plugging the answers will solve it..

16x + 8y = 80

x + y =7

x + x + y = 10

x + 7 = 10
x = 3
y = 4

8y = 32

circumference = 2*pi*r = d * pi --- 1

As ABC is Equilateral triangle, it cuts circle into equal parts.
ab = bc = ac --- 2

ab + bc = 24; --- 3
from 2 and 3.
ab = bc = ac =12.

circumference = ab + bc +ac = 36

from 1
36 = pi *d

d = 36 * 7 /22

d ~ = 11

Hi, Let P be the total amount of work required to finish the job. Assuming all men are equally efficient with work rate 'm' and all women are equally efficient with work rate 'w'. we get 4m + 3w = P/6 ->eqn(1) 5m + 7w = P/4 ->eqn(2) Multiplying eqn(1) by 2 and adding to it eqn(2), we get 13m+13w=7P...